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Lighting device implemented through utilizing insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs)

a technology of piezoelectric transformer and light-emitting diodes, which is applied in the direction of machines/engines, process and machine control, instruments, etc., can solve the problems of reducing the power conversion efficiency of piezoelectric transformer, consuming energy, and generating parasitic oscillations of piezoelectric transformers, so as to reduce energy loss, increase power conversion efficiency, and small leakage current

Active Publication Date: 2012-04-24
MIDAS WEI TRADING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a lighting device that uses an insulating type piezoelectric transformer to drive LEDs. This design reduces energy loss and improves power conversion efficiency. The insulation region on the substrate of the transformer is used to isolate its primary and secondary sides, and an AC voltage is converted to a DC voltage for driving the LEDs. The use of an insulating type piezoelectric transformer eliminates the need for an external rectifier and reduces the cost of integrated circuits. A filter-rectifier circuit and a piezoelectric capacitor can also be used to provide a DC voltage for driving the LEDs. The lighting device is compact and can be used in various applications."

Problems solved by technology

However, as the primary side of the piezoelectric transformer is used to receive a driving voltage and output a voltage with a transformation ratio from a secondary side, and in case that the piezoelectric transformer is driven by signals at a non-resonance frequency range, then the piezoelectric transformer tends to produce parasitic oscillations.
In this way, the secondary side may output power of non-resonance frequency, yet it will consume energy and lower the power conversion efficiency of piezoelectric transformer.
However, in the prior art, a coil-winding type transformer can be used for voltage transformation, therefore, the size of the entire driving device appears to be enormously large, and that is not compatible with the modern requirement of light weight, thin profile, and compact size.
In addition, in performing voltage transformation, the coil-winding type transformer is liable to have magnetic core efficiency loss and thus its power output efficiency is reduced; moreover, the voltage endurance of coil winding is rather insufficient, such that it is liable to be broken through due to suddenly electric jump of power supply to a high voltage, thus resulting in short circuit and being burned out, as such it is highly hazardous.
The cost price of the integrated circuit is high in the total driving circuit.
Thus, the driving circuit of the large size of the LED panel is difficult to reduce the price.

Method used

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  • Lighting device implemented through utilizing insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs)
  • Lighting device implemented through utilizing insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs)
  • Lighting device implemented through utilizing insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs)

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first embodiment

[0025]Refer to FIG. 1 for a schematic diagram of a lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs) according to the present invention. In the present embodiment, the lighting device is an AC type lighting device. As shown in FIG. 1, the lighting device of the present invention comprises: a light-emitting-diode (LED) module 11 and at least an insulating type piezoelectric transformer 12. The LED module includes: a plurality of light-emitting-diodes 111 of the first polarity and a plurality of light-emitting-diodes 112 of the second polarity connected together in parallel. Wherein, the polarity of a plurality of light-emitting-diodes 111 of the first polarity is opposite to that of a plurality of light-emitting-diodes 112 of the second polarity, and they can be arranged alternatively and then connected in parallel to form a light-emitting-diode (LED) module 11. The insulating type piezoelectric transfor...

second embodiment

[0029]Refer to FIG. 3 for a schematic diagram of a lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs) according to the present invention. As shown in FIG. 3, its difference with FIG. 1 is that, a resonance inductor L1 is additionally added, and that is connected in series with a first upper electrode 201 on the primary side of the insulating type piezoelectric transformer 12 to form a half bridge resonance circuit. The light-emitting-diode (LED) module 11 is formed by a plurality of light-emitting-diodes 111 of the first polarity and a plurality of light-emitting-diodes 112 of the second polarity connected in parallel. The polarity of the light-emitting-diodes 111 of the first polarity is opposite to that of the light-emitting-diodes 112 of the second polarity. When it is operated at the resonance frequency of the resonance inductor L1 and the insulating type piezoelectric transformer 12, and the input p...

third embodiment

[0030]In case that it is desired to raise the power output of the entire light-emitting-diode module 11, refer to FIG. 4 for a schematic diagram of a lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs) according to the present invention. As shown in FIG. 4, in the present embodiment, two resonance inductors L1 and L2 are added. The resonance inductors L1 and L2 are connected separately in series with a first upper electrode 201 and a first bottom electrode 202 on the primary side of an insulating type piezoelectric transformer 12 to form a full bridge resonance circuit. The light-emitting-diodes 111 of the first polarity and the light-emitting-diodes 112 of the second polarity are connected separately to a second upper electrode 203 and a second 1 bottom electrode 204 of an insulating type piezoelectric transformer 12. When it is operated at the resonance frequency of the resonance inductors L1, L2 and th...

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Abstract

A lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs), comprising at least said insulating type piezoelectric transformer connected to an LED module, a primary side of said insulating type piezoelectric transformer is used to receive a pulse voltage, and that is converted into an AC voltage in a piezoelectric voltage transformation way, and said AC voltage is output from a secondary side of said insulating type piezoelectric transformer to said LED module in proceeding with lighting function. Due to its various advantages of small leakage current, good insulation capability, high voltage endurance, low operation temperature, compact size, thin profile, high energy conversion efficiency, said insulating type piezoelectric transformer can be used to not only raise lighting efficiency, but also reduce overall size of said lighting device.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs), and in particular to a lighting device implemented through utilizing an insulating type piezoelectric transformer in raising power conversion efficiency, so as to optimize the lighting efficiency of the light-emitting-diodes (LEDs).[0003]2. The Prior Arts[0004]In recent years, the tendency of development of information-related products is toward light weight, thin profile, and compact size, so that it is becoming increasingly popular and common in utilizing piezoelectric transformer in driving backlight unit of liquid crystal display (LCD). The basic design principle of piezoelectric transformer is that: the energy exchange and conversion effects between electrical field and mechanical field are used to transform power voltage, thus it has the various adva...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B37/02H05B44/00H10N30/40
CPCH05B33/0812Y02B20/343H05B45/42G09G3/3406G09G2360/145Y02B20/30H05B45/395
Inventor WEI, TAO-CHIN
Owner MIDAS WEI TRADING